a disease in which males possess a penis that is so tremoundously small that the doctors at his birth mistook him for not having a gender due to the absence of any gentials
Dad: Is it a boy or a girl?
Mom: I have no idea
Doctor: It is a boy. However, he suffers from femtopenis
Dad: Oh fuck
An infinitesimally small penis. It is even smaller than a picopenis, let alone a nanopenis. It's so small that not even a magnifying glass is enough to see it. The only possible way to view a femtopenis is through an electron microscope.
It's a commonly accepted fact that Putin has a femtopenis.